Praeaphanostoma diatomovorum, Atherton & Jondelius, 2022
publication ID |
https://doi.org/ 10.11646/zootaxa.5169.5.1 |
publication LSID |
lsid:zoobank.org:pub:EB5A2C38-2D31-4F02-BEC1-2AA31761EFEA |
DOI |
https://doi.org/10.5281/zenodo.6952705 |
persistent identifier |
https://treatment.plazi.org/id/CF6B87F3-E637-851B-FF6F-FE6CFAB3FC24 |
treatment provided by |
Plazi |
scientific name |
Praeaphanostoma diatomovorum |
status |
sp. nov. |
Praeaphanostoma diatomovorum View in CoL sp. nov.
Figure 8 View FIGURE 8
Zoobank registration. urn:lsid:zoobank.org:act:091F3968-6642-44CD-9799-37A65EFB701C
Materials examined. Serial sectioned specimen, Holotype ( SMNH Type-9453); Digital video and photographs of original living specimens and serial sectioned specimens, Paratypes ( SMNH Type-9454– SMNH Type-9467) .
Type locality. Klubban beach, Gullmarsfjorden, Sweden, 58°15’05 N, 11°27’52 E GoogleMaps ; Kvarnbukten , Bohuslän, Sweden, 58°15’31 N, 11°28’28 E GoogleMaps
Habitat. 1–2.5 m depth, marine, silty sand with organic content; 1–1.5 m depth, medium sand
Diagnosis. Body length 0.5–0.9 mm. Body pigmentation absent. Frontal organ moderate in size. Rhabdoid glands sparse in rows. Vacuoles absent. Testes paired; ovary unpaired. Seminal bursa present without ornamentation. Short vagina connects to common antrum and gonopore. Male copulatory organ subterminal without penis.
Etymology. This species is named in reference to the numerous diatoms present in the digestive parenchyma of the type specimens.
Description. Living specimen 0.5–0.9 mm in total body length depending on state of elongation and 0.12–0.2 mm in maximum width at point of largest egg. Specimens in squeeze-preparation drop-shaped; free-swimming specimens more elongate with rounded anterior and posterior ends. Body colorless, transparent, except for parenchyma, which varies from green or yellowish-brown based on microalgae food. Digestive parenchyma extends from ¼ body length from the anterior to level of posterior egg. Mouth present just past ¼ body length from anterior end, ~22 µm in width.
Frontal organ extending from anterior end to just posterior to statocyst. Statocyst present 90–110 µm from anterior end, 11 µm in diameter with 8 µm in diameter statolith. Epidermis completely ciliated and ~4 µm wide in longitudinal sections. Cilia 4–6 µm long. Rhabdoid glands present in longitudinal rows, sparse and best visible at the posterior end. Posterior rhabdoids partially subepidermal, colorless, 9–10 µm in length.
Ovary unpaired with up to four eggs. Seminal bursa present just posterior to largest egg. Bursa globular or eggshaped with narrower, tapering proximal part; width to 36 µm (24–36 µm) and length to 65 µm (46–65 µm). Bursa typically filled with evident sperm. Bursal nozzles or appendages absent. A short unciliated vagina connects the bursa ventrally to a common antrum and gonopore.
Testes paired, located just posterior of the midbody and anterio-lateral to the ovary. Seminal vesicle subterminal in posterior end, spherical or globular with a width of 23–38 µm and a length of 25–38 µm. Penis absent.
SMNH |
Department of Paleozoology, Swedish Museum of Natural History |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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