Aegistohadra seraphinica Wu 2023, comb. nov.
Creators: name: Wu, Min
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Stylommatophora
Camaenidae
Aegistohadra
Aegistohadra seraphinica

description: Aegistohadra seraphinica (Heude, 1889) comb. nov.
Figs 1; 2 A–B; 4 A–C; 5; 6; 9B
Helix seraphinica Heude, 1889: 225; Heude, 1890: 141, pl. 38, fig. 11;. Wu, 2004: 118, fig. 33.
Helix (Camaena) seraphinica Pilsbry, 1890: 199, pl. 69, figs 6, 7.
Material examined. HBUMM08466 a, a fully mature animal with repaired aperture; near 23º37.8’N 102º50.9’E, Jianshuixian [建水县], Honghe [Ḧ河], Yunnan Province, China; 2019, coll. Bai Hao-Chen [白DZOi] and a local collector.
General anatomy (Figs 4 A–C). Eversible head wart flat but distinct. Mantle lobe very broad, extending from mid line to lateral side, with posterior part developed and leave-shaped (Fig. 4A, arrowed). Suprapneumostomal lobes developed (Fig. 4B, arrowed). Body uniformly yellowish brown, without mosaic pigmentation. Sole creamy white. Jaw arcuate, with approximate 5 projecting ribs.
Genital anatomy (Figs 5–6; 9B). Terminal genitalia encapsulated with a thick layer of connective tissue. Penial sheath absent. Penis tube-shaped, distally with an elongate conical and terminally pointed penial caecum. Proximal 1 / 2 penis internally with two very thick smooth longitudinal pilasters, then each branching off and broken into several series of granules, which form a more or less transversal ridge, or a papilla, which partially separates the penis and the epiphallus and the distal part of which extends into the penial caecum. Penis-epiphallus chamber absent. In penial caecum pilasters come from those of both penis and epiphallus. Epiphallus much thinner than penis, internally with approximately 5 pilasters of the same thickness. Flagellum about as long as epiphallus, slowly tapering; internally, one of inner folds forming a closed tube rather than an opened C-shaped pilaster towards terminal flagellum and opening at vas deference entrance. Penial retractor muscle attached at proximal 1 / 3 of epiphallus. Vas deferens of same thickness, opening at internal epiphallus by a valve-like entrance. Dart sac very developed, long, with an accessory sac between dart sac and vagina. Love dart one, fully calcified, somewhat twisted and asymmetric along the longitudinal axis, about 24.0 mm long, with cross section apically sharply two-bladed and then ovate (Fig. 6). Accessory sac large, sac-shaped and with median constriction, internally spongy, entering into distal dart chamber (Figs 5 A–C; 6A; 9B). Mucous glands as long as dart sac, tied tightly to the trunk of vagina, with two lobules that are extremely complicatedly branched. Two stalks of mucous glands merged into one that composed of many tubes (Fig. 5C), then entering chamber of accessory sac. A developed proximal accessory sac, in size less than 1 / 3 of dart sac, present at lateral middle on left side of dart sac apparatus (Figs 5A; 9B). Proximal accessory sac with a very thick muscular outer wall (Fig. 9B), opening to dart chamber between entrances of accessory sac and vagina. Vagina about 1 / 2 length of dart sac. Bursa copulatrix duct proximally thick and tapering. Bursa copulatrix oval.
Distribution (Fig. 1). Si-lin (Ħff = today’s Tianlinxian [.ff县], the Guangxi Zhuang Autonomous Region; type locality); Jianshuixian [建水县, Yunnan Province].
Remarks. The shell of specimen HBUM- M08466a is a fully mature one with a repaired aperture. The residual trace of the original aperture on the shell (Fig. 2A) suggests that the specimen has the same obliquity of the descending whorl near aperture as that in the paratypes of Helix seraphinica Heude, 1889. Furthermore, the specimen coincides with the paratypes of H. seraphinica on the coloration, banding, shell shape and measurement (compare Fig. 2A to fig. 33 in Wu 2004). Based on the genital anatomy (Fig. 5), this species has to be moved to Aegistohadra.
description: Published as part of Wu, Min, 2023, A new Aegistohadra (Gastropoda: Camaenidae) from southwest China, pp. 59-71 in Ruthenica, Russian Malacological Journal (Cambridge, England: 2003) (Cambridge, England: 2003) 33 (2) on page 60, DOI: 10.35885/ruthenica.2023.33(2).2, http://zenodo.org/record/11041496