Austruca mjoebergi
Creators: name: Michie, Laura A.
name: Barnes, R. S. K.
name: Clark, Paul F.
name: Bennett, Wayne A.
name: Cragg, Simon M.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Ocypodidae
Austruca
Austruca mjoebergi

description: <i>Austruca mjoebergi</i> (Rathbun, 1924) (Figure 4a–j) <b>Material examined.</b> 20 &amp;female;, 20 &amp;male;, Kaledupa, Indonesia, 5º 29’ 50’’S, 123º 45’ 20’’E, mud flat in front of mangroves, coll. L. Michie, 26.08.2014. <b>Diagnosis</b>. Carapace: slightly broader than long; smooth; front broad; anterolateral angles moderately acute and slightly produced; anterolateral margins slightly convergent; anterolateral and dorsolateral margins short or nearly absent. Major cheliped: dactyl and pollex twice as long as manus; pollex almost straight; dactyl slightly wider than fixed finger, with sub-proximal tooth. <b>Colouration</b> (Figure 4a–d). Adult male. Carapace: light brown with yellow/brown mottled pattern, ventral surface of carapace and merus of third maxilliped generally similar to carapace. Major cheliped: dactyl and pollex yellow with white tips, remainder of cheliped yellow. Minor cheliped &amp; ambulatory legs: black or grey with mottled pattern, occasionally grey/white/yellow striped. Adult female. Similar to male. Juvenile male. Carapace: usually light brown with pattern and colour developing with maturity. Major cheliped: normally light brown or yellow. Juvenile female. Similar to male. <b>Gonopod morphology</b> (Figure 4e–h). G1 curved in dorso-lateral direction; border between protuberance and terminal end swollen; protuberance moderately short, sometimes reaching base of termination, longer than broad; distal end has largely protruding dorsal lobe; pore of sperm channel marked by distinct indentation. <b>Gastric mill</b> (Figure 4i–j). Urocardiac ossicles complex, with 2 transverse ridges of median teeth, both large, different in shape with first being strongly arched; second much broader; stem region has 5 pairs of cusps, 1–3 of similar size and shape, 4 and 5 decreasing in size distally. Lateral tooth plate with 17 comb-shaped teeth. <b>Biology.</b> <i>Austruca mjoebergi</i> is a small-size species (largest male CL = 7.3 mm, CB = 13.3 mm, largest female CL = 6.8 mm, CB = 10.8 mm); one of least abundant species on site, present on margin of mangroves in mid intertidal zone. <b>Distribution</b>. Northwest Territory and Western Australia, New Guinea and central Indonesia. <b>Remarks.</b> The specimens examined fit that of Naderloo <i>et al.</i> (2010), differing slightly in the form of the gastric mill with the stem region described here having a higher number of cusps, but the urocardiac ossicles are still complex. The largely protruding dorsal lobe of the G1 and the distinct yellow colour of the major cheliped distinguish <i>A. mjoebergi</i> from the other Ambeua <i>Austruca</i> species.
description: Published as part of <i>Michie, Laura A., Barnes, R. S. K., Clark, Paul F., Bennett, Wayne A. &amp; Cragg, Simon M., 2021, Distinguishing ten sympatric species of fiddler crab (Decapoda: Ocypodidae) using a suite of phenotypic characteristics, pp. 480-506 in Zootaxa 5026 (4)</i> on page 486, DOI: 10.11646/zootaxa.5026.4.2, http://zenodo.org/record/5300736
description: {"references": ["Naderloo, R., Turkay, M. &amp; Chen, H. - L. (2010) Taxonomic revision of the wide-front fiddler crabs of the Uca lactea group (Crustacea: Decapoda: Brachyura: Ocypodidae) in the Indo-West Pacific. Zootaxa, 2500 (1), 1 - 38. https: // doi. org / 10.11646 / zootaxa. 2500.1.1"]}