Summary Paleon Ebi

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The Ambulacrum attaches to the theca just left of the midline, around 70% along the total length of the theca (Fig. 6). It measures approximately 36 mm in length in individual 1 and tapers distally to a rounded tip. The stele is at least 76 mm long and is divided into three parts: (1) the proxistele, (2) the mesistele, and (3) the dististele. The broad proximal region (the proxistele) makes up around one-fifth of the total length of the stele; it averages approximately 6.5 mm wide (tapering distally) and consists of 13–16 smooth, flexible, tetramerous rings. Each ring is composed of four large, curved plates, which imbricate laterally and axially. These plates average approximately 1.1 mm long and 3 mm wide, and they enclose a large lumen internally. The insertion of the proxistele into the theca is unclear in the three new

description

paleo

Transcript of Summary Paleon Ebi

Page 1: Summary Paleon Ebi

The Ambulacrum attaches to the theca just left of the midline, around 70% along the total length of the theca (Fig. 6). It measures approximately 36 mm in length in individual 1 and tapers distally to a rounded tip.

The stele is at least 76 mm long and is divided into three parts: (1) the proxistele, (2) the mesistele, and (3) the dististele. The broad proximal region (the proxistele) makes up around one-fifth of the total length of the stele; it averages approximately 6.5 mm wide (tapering distally) and consists of 13–16 smooth, flexible, tetramerous rings. Each ring is composed of four large, curved plates, which imbricate laterally and axially. These plates average approximately 1.1 mm long and 3 mm wide, and they enclose a large lumen internally. The insertion of the proxistele into the theca is unclear in the three new individuals, but

the morphology of the holotype suggests that it was deeply excavated.

Fig. 6 Dehmicystis globules (Dehm, 1934). a, b Photograph and interpretative sketch of individuals 1 and 2, 91.5.

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*: Abp Adbrachial plate,

Am ambulacrum,

An anus,

AnP anal platelets,

AsP adsteleal plate,

CZ contact zone between the ambulacrum and the theca,

FP flooring plates,

Hy hydropore, Me mesistele, Pr proxistele, SP suranal plates, TO thecal ornamentation

The exposed surface is disrupted in places but apparently comprises an alternating biseries of large, curved plates (the flooring plates or brachials) (Fig. 6); there are at least 44 pairs of plates, which meet tightly at their inner margins, giving a zigzag suture, but overlap at their proximal margins (Fig. 6). These plates average approximately 0.7 mm.Dehmicystis is diagnosed by a unique character combination that consists of only two putative autapomorphies (an anus with a pair of suranal plates and thecal ornamentation at plate sutures), which may not be suitable characters for familial assignment within solutes, we prefer to leave

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the genus unassigned at family level pending future phylogenetic studies incorporating our new morphological data.

SUMMARY BHS INDO

Ambulacrum melekat pada bagian kiri dari garits tengah theca, sekitar 70% dari total panjang Theca. Ukurannya sekitar 36mm dalam panjang suatu individual.

Pada Stele, setidaknya memiliki panjang sekitar 76mm yang di bagi menjadi 3 bagian yaitu: proxistele (1), mesistele (2) dan dististele (3). Luas wilayah proksimal (proxistele) membuat sekitar seperlima dari total panjang dalam Stele. Stele ini rata-rata memiliki ukuran sekitar 6.5 mm lebar (meruncing distal) dan terdiri dari 13-16 tetramerous rings yang halus dan fleksible. Setiap cincin ini terdiri dari empat plate besar, melengkung, yang bentuknya imbricate lateral dan aksial. Rata-rata ukuran lempengnya sekitar 1,1 mm panjang dan lebar 3 mm, dan mereka melampirkan lumen besar secara internal.

Dehmicystis didiagnosis oleh kombinasi karakter unik yang terdiri dari hanya dua autapomorphies (anus dengan sepasang plate suranal dan thecal ornamen di plate jahitan), yang mungkin tidak cocok karakter untuk familial dalam solutes.

Ambulacrum adalah bagian tabung dari fosil biasanya dilapisi oleh kalsit.

Theca adalah dinding atau pelapis atau case dari suatu fosil.

Stele adalah akar atau bagian dalam dari suatu batang.