Free Access
Table 2
Comparison between Australian members of the genus Macrothrix Baird, 1843 (after Smith, 1909; Gurney, 1927; Smirnov and Timms, 1983; Smirnov, 1976 (we kept Russian letters for original illustrations); 1992 and our current data)
| Species | Maximum body length, mm | Shape of antenna I | Some main diagnostic features | Remarks |
|---|---|---|---|---|
| Macrothrix australiensis sp. nov. | 1 mm | Rod-like antenna I | Head ventral margin is inflated or with projection. Short spine is located on the second exopod segment (about 1/3 of third exopod segment length) and short additional spines are on the second and third exopod segments. Distal segment of postabdominal seta is short and covered by long setules. Postabdomen with fine spinules on dorsal margin. | Exactly belongs to M. paulensis species group because of size, rod-like antennas I and a single ejector hook on the thoracic limb I. |
| Macrothrix breviseta Smirnov, 1976 | 0.56 mm for holotype (Smirnov, 1976: p. 95) | Dilating antenna I (Smirnov, 1976: p. 95, fig. 67Г) | Very long spine is located on the second exopod segment (subequal in length to the third exopod segment) (Smirnov, 1976: fig. 67AII). Distal segment of postabdominal seta is short. Postabdomen bears robust spinules on preanal margin (Smirnov, 1976: p. 95, fig. 67П). | Do not belong to M. paulensis species group because of dilating antennas I. |
| Macrothrix burstalis Smith, 1909 | 0.4 mm (Smith, 1909) | Antenna I are more or less rod-like (see description in Smirnov, 1976) | Morphology is studied inadequately (Smirnov, 1976). | Species inquirenda, not considered as valid taxon (Smirnov, 1992; Kotov et al., 2013a). |
| Macrothrix carinata (Smirnov, 1976) | 0.65 mm for holotype (Smirnov, 1976: p. 124) | Rod-like antenna I (Smirnov, 1976: p. 124, fig. 104AI) | Head ventral margin without projection (Smirnov, 1976: fig. 104Г). Long spine is located on the second exopod segment (3/4 of third exopod segment length) (Smirnov, 1976: fig. 104AII). Distal segment of postabdominal seta is short. Postabdomen bears robust denticles on preanal and postanal margin (Smirnov, 1976: fig. 104П). | Potentially may be a member of M. paulensis species group because of rod-like antennas I. |
| Macrothrix flabelligera Smirnov, 1992 | 0.6 mm (Smirnov, 1992: p. 82) | Rod-like antenna I (Smirnov, 1992: fig. 343) | Head ventral margin without projection (Smirnov, 1992: fig. 343). Short spine is located on the second exopod segment (1/4 of third exopod segment length) and short additional spines are on the second and third exopod segments (Smirnov, 1992: fig. 346). Distal segment of postabdominal seta is short, with very long setules (Smirnov, 1992: fig. 342). Postabdomen with robust spinules on dorsal margin (Smirnov, 1992: fig. 350). | Potentially may be a member of M. paulensis species group because of rod-like antennas I. |
| Macrothrix flagellata (Smirnov and Timms, 1983) | 1.39 mm for holotype (Smirnov and Timms, 1983: p. 80) | Rod-like antenna I (Smirnov and Timms, 1983: fig. 93c). | Head ventral margin slightly inflated (Smirnov and Timms, 1983: fig. 93a). Spine on the second exopod segment is about two times shorter than third exopod segment (Smirnov and Timms, 1983: fig. 93d). Distal segment of postabdominal seta is longer than proximal segment (Smirnov and Timms, 1983: fig. 93b). | Potentially may be a member of M. paulensis species group because of size and rod-like antennas I. |
| Macrothrix hystrix Gurney, 1927 | 0.72 mm (Smirnov, 1992: p. 70) | Dilating antenna I (Gurney, 1927) | Morphology is studied inadequately (Smirnov, 1992). | Do not belong to M. paulensis species group because of dilating antennas I. |
| Macrothrix indistincta Smirnov, 1992 | 0.9 mm (Smirnov, 1992: p. 47) | Dilating antenna I (Smirnov, 1992: p. 47, fig. 166) | Spine on the second exopod segment is about two times shorter than third exopod segment (Smirnov, 1992: fig. 167). Distal segment of postabdominal seta is short and covered by long setules (Smirnov, 1992: fig. 168). Postabdomen with robust spinules on postanal margin (Smirnov, 1992: fig. 169). | Do not belong to M. paulensis species group because of dilating antennas I. |
| Macrothrix longiseta Smirnov, 1976 | 0.73 mm for holotype (Smirnov, 1976: p. 91) | Dilating antenna I (Smirnov, 1976: p. 91, fig. 61АI) | Spine on the second exopod segment is about two times shorter than third exopod segment (Smirnov, 1976: fig. 61АII) Distal segment of postabdominal seta is in 1.5 times longer than proximal segment (Smirnov, 1976: p. 91, fig. 61: general view). Postabdomen with robust spinules on postanal margin (Smirnov, 1976: fig. 61П). | Do not belong to M. paulensis species group because of dilating antennas I. |
| Macrothrix pectinata (Smirnov, 1976) | 0.67 mm (Smirnov, 1976: p. 137) | Rod-like antenna I (Smirnov, 1976: fig. 118Г) | Head ventral margin without projection (Smirnov, 1976: fig. 118Г). Long spine is located on the second exopod segment (3/4 of third exopod segment length), and there are groups of long additional spines on the second and third exopod segments (Smirnov, 1976: fig. 118AII). Distal segment of postabdominal seta is short. Postabdomen bears robust spinules on preanal margin (Smirnov, 1976: fig. 118П). | Potentially may be a member of M. paulensis species group because of rod-like antennas I. |
| Macrothrix spinosa King, 1853 | Not more than 0.5 mm (Smirnov, 1992) | Dilating antenna I (Smirnov, 1992: fug. 69) | Short spine is located on the second exopod segment (less than half of third exopod segment) (Smirnov, 1992: fig. 70). Distal segment of postabdominal seta is short. Postabdomen covered by robust spinules on postanal margin (Smirnov, 1992: fig. 72). | Do not belong to M. paulensis species group because of dilating antennas I. |
| Macrothrix schauinslandi Sars, 1904 | 1 mm (Smirnov, 1992: p. 60) | Rod-like antenna I (Smirnov, 1992: 246-247) | Head ventral margin is slightly inflated (Smirnov, 1992: fig. 246). Short spine is located on the second exopod segment (less than half of third exopod segment). A short pseudospine is on the third exopod segment (Smirnov, 1992: fig. 250). Seta on proximal endopod segment is covered by robust and long spinules (Smirnov, 1992: fig. 251). Distal segment of postabdominal seta is subequal in length to proximal segment (Smirnov, 1992: fig. 249). | Potentially may be a member of M. paulensis species group because of size and rod-like antennas I. |
| Macrothrix timmsi (Smirnov, 1976) | 0.68 mm (Smirnov, 1976: p. 135) | Rod-like antenna I (Smirnov, 1976: fig. 116AI). | Head ventral margin without projection, but slightly inflated (Smirnov, 1976: fig. 116, general view). Spine located on the second exopod segment is about two times shorter than third exopod segment (Smirnov, 1976: fig. 116AII). Distal segment of postabdominal seta is short, with very long setules (Smirnov, 1976: fig. 116Пa). Postabdomen is covered by robust denticles on preanal margin (Smirnov, 1976: fig. 116Пa–П6). | Exactly belongs to M. paulensis species group because of size, rod-like antennas I and a single ejector hook on the thoracic limb I. |
| Macrothrix williamsi (Smirnov and Timms, 1983) | 0.58 mm for holotype (Smirnov and Timms, 1983: p. 80) | Rod-like antenna I (Smirnov and Timms, 1983: fig. 92c). | No information on the head ventral margin. Antenna II possesses very robust additional spines and spinules on all exopod segments (Smirnov and Timms, 1983: fig. 92d). Seta of proximal endopod segments is covered by very long and robust spinules (Smirnov and Timms, 1983: fig. 92e). Distal segment of postabdominal seta is short (Smirnov and Timms, 1983: fig. 92b). Postabdomen bears robust denticles on preanal and postanal margin (Smirnov and Timms, 1983: fig. 92b). | Potentially may be a member of M. paulensis species group because of rod-like antennas I. |
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.