Oonops

Lipke, Elisabeth & Michalik, Peter, 2015, Evolutionary Morphology Of The Primary Male Reproductive System And Spermatozoa Of Goblin Spiders (Oonopidae; Araneae), Bulletin of the American Museum of Natural History 2015 (396), pp. 1-72 : 38-42

publication ID

https://doi.org/ 10.1206/906.1

DOI

https://doi.org/10.5281/zenodo.4633318

persistent identifier

https://treatment.plazi.org/id/03E487E0-303C-214B-2D6A-A23861097F21

treatment provided by

Felipe

scientific name

Oonops
status

 

Oonops View in CoL View at ENA sp. (Ibiza)

SPERM TRANSFER FORM ( figs. 22 View Fig , 23 View Fig ): Small (,5 Mm), mainly oval-shaped synsper-

mia ( figs. 22 View Fig , 23A View Fig ) comprising two sperm ( figs. 22 View Fig , 23B View Fig ). A distinct, electron-dense vesicular area surrounds all main cell components ( fig. 23 View Fig A–C). The cytoplasm appears granular ( fig. 23C, E View Fig ). Synspermia are unsheathed; instead, several sperm conjugates cluster in the distal deferent duct, embedded in a distinct secretion matrix ( fig. 23A View Fig ).

Spermatozoa ( figs. 22 View Fig , 23 View Fig ): Acrosomal complex: AV long (,3.9 Mm), cylindrical; narrow subacrosomal space ( fig. 23C View Fig ). AF originates from the subacrosomal space, ends in the region of the axonemal base. Nucleus: prcN compact (,4.3 Mm) and tubelike ( fig. 22 View Fig ) with a distinct crest, on which the nuclear canal is running ( figs. 22 View Fig , 23D, E View Fig ). The implantation fossa is small but wide ( fig. 23 D, E View Fig ). Besides a little granular material, presumably glycogen ( fig. 23D View Fig ), the implantation fossa contains the two centrioles and the base of the Ax ( fig. 23E View Fig ). peN nearly as long as prcN (,2.9 Mm) and flattened ( figs. 23 View Fig , 24E View Fig ). NC located in the periphery, on a distinct crest ( fig. 23E View Fig ). Axoneme: long

(,23.4 Mm), 9+3 microtubular pattern ( fig. 23E View Fig inset).

NOTES ON SPERMIOGENESIS ( fig. 24 View Fig ): Within the testis all stages of spermiogenesis

are present; spermatids are arranged in cysts of the same developmental stage. Early spermatids are characterized by a large, mainly spherical nucleus that is surrounded by a manchette of microtubules ( fig. 24A View Fig ), and a developing acrosomal complex, which is attached to the anterior pole of the nucleus ( fig. 24A View Fig ). During further differentiation, the acrosomal vacuole sinks into the nucleus ( fig. 24B, C View Fig ). Simultaneously, the two centrioles migrate toward the posterior pole of the nucleus, consequently forming an implantation fossa ( fig. 24B View Fig ). The posterior portion of nucleus is constricted, resulting in a small neck. Chromatin condensation occurs heterogeneously and shows a specific pattern, in which a distinct crest of dense chromatin is separated from the remaining, tubelike condensing chromatin of the nucleus ( fig. 24B View Fig ). The NC that contains the AF is located in the periphery of this crest ( fig. 24B, D View Fig ). At the end of spermiogenesis, the Ax is retracted and coils within the cell membrane ( fig. 24E View Fig ). At the same time, several electron-dense vesicles fuse, initiating formation of a distinct vesicular area that surrounds all main sperm cell components ( fig. 24E, F View Fig ). Finally, two spermatids that are still connected via cellular bridges fuse, forming synspermia ( fig. 24E, F View Fig ).

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Oonopidae

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