Austruca triangularis (A. Milne-Edwards, 1873)

Zhang, Ying-Chen & Shih, Hsi-Te, 2022, Fig. 3 in Historical Biogeography of the Group (Anura, Leptodactylidae): Identification of Ancestral Areas and Events that Modeled their Distribution., Zoological Studies 61 (71), pp. 1-29 : 6-7

Austruca triangularis (A. Milne-Edwards, 1873)

( Fig. 4 , Table 3)

Material examined: zoea I (from ñ 13.8 mm, NCHUZOOL 16771, Baoli River estuary, Pingtung, coll. Y.-C. Zhang et al., 18 Oct. 2020); zoea I (from ñ 11.4 mm, NCHUZOOL 16772, Baoli River estuary, Pingtung, coll. Y.-C. Zhang et al., 20 Oct. 2020).

Size: cl. 0.42 ± 0.011 mm, rdl. 0.67 ± 0.029 mm, dsl. 0.13 ± 0.007 mm, rsl. 0.16 ± 0.013 mm.

Carapace ( Fig. 4A ): Lateral spines lacking, dorsal spine curved, relatively short, rostral spine straight, dorsal spine and rostral spine with pointed termination. Eyes round and sessile.

Antennule ( Fig. 4B ): Uniramous, endopod absent. Exopod smooth, unarticled, with 2 aesthetascs and 2 simple setae terminally.

Antenna ( Fig. 4C ): Protopod basal region smooth, distal end acuminate, bearing 2 rows of spines. Exopod short, with 2 terminal simple setae, setae not reaching tip of protopod. Endopod absent.

Maxillule ( Fig. 4D ): Epipod seta absent; coxal endite with 4 plumodenticulate setae and 1 plumose seta; basial endite with 4 plumodenticulate setae and 1 plumose seta; endopod 2-articled, proximal article without setae, 4 sparsely plumose in distal article; exopod seta absent.

Maxilla ( Fig. 4E ): Coxal endite bilobed with 3+3 plumose setae; basial endite bilobed with 5+4 plumose setae; endopod bilobed with 1+2 terminal sparsely plumose; scaphognathite with 4 densely plumose setae and a long acuminate posterior process with microtrichias.

First maxilliped ( Fig. 4F ): Basis with 2+2+3+2 sparsely plumose setae; endopod 5-articled with 2, 2, 1, 2, 5 plumose setae; exopod 2-articled with 4 terminal long plumose setae.

Second maxilliped ( Fig. 4G ): Basis with 1+1+1+1 sparsely plumose setae; endopod 3-articled with 0, 0, 5 plumose setae; exopod 2-articled with 4 terminal long plumose setae.

Pleon ( Fig. 4H ): With 5 pleonites, second pleonite with a pair of relatively acute dorsolateral spines pointing anterodorsally; third pleonite with a pair of relatively obtuse dorsolateral spines pointing posterodorsally; fourth pleonite wider than other pleonites. Pleopods absent.

Telson ( Fig. 4H ): Telson bifurcated, inner margin with 6 (3+3) serrate spines.

Figures

Fig. 4. Austruca triangularis, zoea I. A, carapace; B, antennule; C, antenna; D, maxillule; E, maxilla; F, first maxilliped; G, second maxilliped; H, pleon and telson.