Gelasimus Latreille, 1817

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 : 7-9

Gelasimus Latreille, 1817 Gelasimus borealis ( Crane, 1975) ( Fig. 5 , Table 3)

Material examined: zoea I (from ñ 23.1 mm,

NCHUZOOL 16773, Dajia River estuary, Taichung, coll. Y.-C. Zhang et al., 11 Sep. 2018); zoea I (from ñ 22.0 mm, NCHUZOOL 16774, Dajia River estuary, Taichung, coll. Y.-C. Zhang et al., 13 Sep. 2018).

Size: cl. 0.32 ± 0.011 mm, rdl. 0.41 ± 0.015 mm, dsl. 0.04 ± 0.006 mm, rsl. 0.06 ± 0.008 mm.

Carapace ( Fig. 5A ): Lateral spines lacking, dorsal spine curved and very reduced, rostral spine straight and very reduced, dorsal spine as long as rostral spine and pointed termination. Eyes round and sessile.

Antennule ( Fig. 5B ): Uniramous, endopod absent. Exopod smooth, unarticled, with 2 aesthetascs and 2 simple setae terminally.

Antenna ( Fig. 5C ): Protopod basal region smooth, distal end acuminate, bearing 2 rows of spines. Exopod short, with 1 terminal simple seta, seta not reaching tip of protopod. Endopod absent.

Maxillule ( Fig. 5D ): 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. 5E ): 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. 5F ): 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. 5G ): 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. 5H ): 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. 5H ): Telson bifurcated, inner margin with 6 (3+3) serrate spines.

Figures

Fig. 5. Gelasimus borealis, zoea I. A, carapace; B, antennule; C, antenna; D, maxillule; E, maxilla; F, first maxilliped; G, second maxilliped; H, pleon and telson.