Catapyrgus jami, Verhaegen & Haase, 2021

Verhaegen, Gerlien & Haase, Martin, 2021, All-inclusive descriptions of new freshwater snail taxa of the hyperdiverse family Tateidae (Gastropoda, Caenogastropoda) from the South Island of New Zealand, European Journal of Taxonomy 731, pp. 71-96 : 79-82

Catapyrgus jami sp. nov.

urn:lsid:zoobank.org:act:98955097-7D04-4822-8408-30E37B79766B

Figs 4 A–B, 5A , 6 A, 7 , 8 A, 9 ; Tables 1 – 2

Diagnosis

Catapyrgus jami sp. nov. is most similar to C. matapango , however but is, genetically distinct at 59 alignment positions. Furthermore, it differs from its congeners in the shape of the bursa copulatrix, which is globular rather than kidney-shaped.

Etymology

Catapyrgus jami sp. nov. is named after Jochen A. Modess, musician and composer who until his retirement from the university in 2019 has significantly shaped the cultural life of the city of Greifswald for over 25 years. The name is based on the initials of the dedicatee.

Material examined

Holotype ( Fig. 4A ) NEW ZEALAND • Kahurangi National Park , SW of Collingwood, Kaituna Track; 40°42ʹ36.3ʺ S, 172°33ʹ36.3ʺ E; 28 Feb. 2016; G. Verhaegen and M. Haase leg.; on leaves, stones, woody debris in small spring; NMNZ.M.330187 .

Paratypes ( Fig. 4B )

NEW ZEALAND • 9 specs; same collection data as for holotype; NMNZ.M.330188 .

Description

SHELL ( Figs 4 A–B, 5A). Short turriform, about 1.7 times as high as than wide, white-translucent with light brown periostracum; protoconch with fine pits comprising 0.75 whorls ( Fig. 6A ); entire shell with 3.875 to 4.25 whorls without structure apart from growth lines; umbilicus narrow; aperture orthocline, almost circular, only slightly higher than wide.

OPERCULUM ( Fig. 7 ). Yellowish to light orange, paucispiral; with non-calcareous white peg in submarginal nucleus.

EXTERNAL FEATURES. Epidermis without pigment; eyes small with bean-shaped pigment spot; tentacles without particular ciliation.

MANTLE CAVITY. No ctenidial filaments; osphradium ovate-elongate.

DIGESTIVE SYSTEM. Radula has formula R 5-6 1 5-6/2 2, L 4-5 1 7, M1 25-29, M2 22-24 ( Fig. 8A ); stomach without caecum; intestine makes narrow, long coil in roof of mantle cavity.

FEMALE GENITALIA (n = 3; Fig 9A ). Ovary short, simple sac not reaching stomach; renal oviduct first coiling 180° clockwise, then 270° counter-clockwise; one small, distal receptaculum seminis; bursa copulatrix globular, behind albumen gland, bursal duct entering ventrally; ovoviviparous, brooding at least one embryo in pallial oviduct, pallial oviduct as brood pouch with albumen gland as well as capsule gland with a larger posterior and short anterior section.

MALE GENITALIA (n = 1; Fig. 9B ). Testis sac with short lobes, starting more than one whorl below apex, comprises ca 0.5 whorl, anteriorly just reaching stomach; vesicula seminalis coils along anterior half of testis; proximal and distal vasa deferentia insert closely in about middle of flat pear-shaped prostate; penis slender, unclear from CT-scans whether it has a lobe or not.

Remarks

Catapyrgus jami sp. nov. is most similar to C. matapango in terms of shell size and shape ( Fig. 3 ). The latter is the only other species of the genus for which sequence data exist. The divergence of the species was fairly large ( Fig. 2 ) with a COI p-distance of 0.07, and 45 and 14 diagnostic characters in COI and 16S, respectively ( Table 2 ). The reduced eyes suggest that this species dwells in the transition zone of epigean and ground waters. The new species occurred sympatrically with Op. lisannea sp. nov.

Figures

Fig. 4. Types. A–B. Catapyrgus jami sp. nov. C–D. Opacuincola lisannea sp. nov. (D from northern locality). E–F. Op. gretathunbergae sp. nov. G–H. Op. mete kahurangi subsp. nov. I–J. Obtusopyrgus farri sp. nov. A, C, E, G, I, holotypes, rest paratypes.

Fig. 5. Shells. SEM photographs of paratypes. A. Catapyrgus jami sp. nov. B–C. Opacuincola lisannea sp. nov. (B, topotype; C, northern locality).D–E. Op. gretathunbergae sp. nov.F–G. Op. mete kahurangi subsp. nov. H–I. Obtusopyrgus farri sp. nov.

Fig. 6. Protoconch. SEM photographs of paratypes. A. Catapyrgus jami sp. nov. B–C. Opacuincola lisannea sp. nov. (B, topotype; C, northern locality). D. Op. gretathunbergae sp. nov. E. Op. mete kahurangi subsp. nov. F. Obtusopyrgus farri sp. nov.

Fig. 7. Operculum of Catapyrgus jami sp. nov.

Fig. 8. Radula. SEM photographs. A. Catapyrgus jami sp. nov. B. Opacuincola lisannea sp. nov. (from type locality). C. Op. gretathunbergae sp. nov. D. Obtusopyrgus farri sp. nov.

Fig. 9. Genitalia of Catapyrgus jami sp. nov. µCT scans. A. ♀. B. ³. Abbreviations: ac = anterior capsule gland; ag = albumen gland; bc = bursa copulatrix; od = oviduct; ov = ovary; pc = posterior capsule gland; pr = prostate; pv = pallial vas deferens; rs = receptaculum seminis; te = testis; vc = ventral channel; vd = vas deferens; vs = vesicula seminalis. Scale bars = 50 µm.

Fig. 3. Shell morphology. Principal component analysis based on five shell measurements of Table 1.

Fig. 2. Phylogenetic analysis. Maximum likelihood tree with bootstrap support> 50 / posterior probabilities from Bayesian analysis> 0.50 for nodes. New taxa in bold. Letters A-E after new taxa refer to localities in Figure 1.